There are thee ways for tracking:

• Cookies
• URL Rewriting
• SSL information

COOKIES

Using cookies is the simplest and most common way to track HTTP sessions, because it requires no special programming to track sessions. When session management is enabled and a client makes a request, the HttpSession object is created and a unique session ID is generated for the client and sent to the browser as a cookie. On subsequent requests to the same hostname, the browser continues to send the same session ID back as a cookie and the Session Manager uses the cookie to find the HttpSession associated with the client.
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